Preparation of cellulose particles using an ionic liquid.
Preparation of cellulose particles using an ionic liquid.
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DOI：
10.1016/j.jcis.2013.12.014
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发表时间：
2014-03
影响因子：
9.9
通讯作者：
Toyoko Suzuki;Kyosuke Kono;Kengo Shimomura;H. Minami
中科院分区：
文献类型：
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作者：
Toyoko Suzuki;Kyosuke Kono;Kengo Shimomura;H. Minami
纤维素是一种普遍存在的天然纤维，用于各种工业材料和应用。我们通过溶剂释放法（SRM）制备微米级纤维素颗粒，其中纤维素-[Bmim]Cl-N,N-二甲基甲酰胺（DMF）液滴分散在含有溶解的表面活性剂的十六烷（HD）中。然后将分散体倒入大量的1-丁醇中。由于 1-丁醇可与 HD、[Bmim]Cl 和 DMF 混溶，但不与纤维素混溶，因此纤维素颗粒会沉淀出来。 FTIR 和 1 H NMR 分析证实，该技术沉淀了纤维素，并从纤维素-[Bmim]Cl-DMF 液滴中完全去除了 [Bmim]Cl 和 DMF。有趣的是，获得的纤维素颗粒几乎与原始液滴（纤维素，7 wt%）大小相同，表明纤维素颗粒具有微孔结构，介质含量大。尽管微孔结构随着介质蒸发而崩溃，但通过冷冻干燥技术得以维持。
Cellulose is a ubiquitous natural fiber used in various industrial materials and applications. We prepared micron-sized cellulose particles by the solvent releasing method (SRM) in which cellulose–[Bmim]Cl–N,N-dimethylformamide (DMF) droplets are dispersed in hexadecane (HD) containing dissolved surfactant. The dispersion is then poured into a large amount of 1-butanol. Since 1-butanol is miscible with HD, [Bmim]Cl, and DMF but not with cellulose, the cellulose particles precipitate out. FTIR and1H NMR analyses confirmed that this technique precipitated cellulose and completely removed [Bmim]Cl and DMF from the cellulose–[Bmim]Cl–DMF droplets. Interestingly, the obtained cellulose particles were almost the same size as the original droplets (cellulose, 7 wt%), indicating a microporous structure of the cellulose particles with a large medium content. Although the microporous structure collapsed as the medium evaporated, it was maintained by a freeze-drying technique.